How can I achieve a "hand-drawn" look?
You need to create 2 or 3 variation meshes to correctly display what you want. You can use 1 emitter but different particle settings (many particle systems inside 1 emitter). Since you´re using hair, the scruffy look is given by the parameters in Kink, Twist and Roughness (use custom roughness curve). Hope this helps. Yes, it will look fantastic, but please create 2 or 3 variations to be used with the 2 or 3 particle systems for the body emitter (one of the systems irremediably will be long feather looking hairs scruffed).

Hope this helps.
BFCT_Schiller